EP1716337B1 - Cutting tool pertaining to a centrifugal pump - Google Patents

Cutting tool pertaining to a centrifugal pump Download PDF

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Publication number
EP1716337B1
EP1716337B1 EP05700789A EP05700789A EP1716337B1 EP 1716337 B1 EP1716337 B1 EP 1716337B1 EP 05700789 A EP05700789 A EP 05700789A EP 05700789 A EP05700789 A EP 05700789A EP 1716337 B1 EP1716337 B1 EP 1716337B1
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EP
European Patent Office
Prior art keywords
cutting
cutting mechanism
mechanism according
pump
mating surface
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Active
Application number
EP05700789A
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German (de)
French (fr)
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EP1716337A1 (en
Inventor
Manfred Zelder
Michael Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wilo SE
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Wilo AG
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Filing date
Publication date
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Priority to PL05700789T priority Critical patent/PL1716337T3/en
Publication of EP1716337A1 publication Critical patent/EP1716337A1/en
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Publication of EP1716337B1 publication Critical patent/EP1716337B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
    • F04D7/045—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous with means for comminuting, mixing stirring or otherwise treating

Definitions

  • the invention relates to a cutting unit of a centrifugal pump for liquids loaded with solids, wherein the cutting unit has a rotating cutting body with at least one flowed through by the liquid, forming a cutting edge and the cutting body facing with a side surface of a rotationally fixed counter surface, which also at least one of the Having liquid flowed through opening.
  • the object of the invention is to improve a cutting unit of a centrifugal pump so that at high cutting performance low wear occurs.
  • Such a cutting unit has a low wear, as the surfaces can slide past each other. This also ensures that the cutting unit and the pump will not clog and in particular elongated foreign body does not wrap around the cutting body and the impeller. For safe storage, such a cutting unit and thus provided centrifugal pump are easy to manufacture and assembly.
  • the cutting unit 1 of a centrifugal motor pump has a rotating cutting body 2, which is attached to the side of the pump impeller, which faces away from the electric motor.
  • the cutting body 2 is cup-shaped and its upper edge surrounds the bush-shaped inlet opening of the impeller.
  • the upper edge 3 preferably has an internal thread 4, or a press fit, with which it can be screwed or pressed onto the external thread or cylindrical receptacle of the impeller inlet opening.
  • the bottom of the cutting body 2 has three inlet openings 5 which are separated from one another by webs 6, on which radial cutting edges 7 are fastened, in particular formed.
  • the blades 7 thus form an angle of 120 degrees with each other.
  • the inlet openings 5 are formed at an angle to the direction of rotation and thus obliquely to the axis of rotation, so that the cutting body 2 acts as an "axial impeller".
  • the underside and thus the side facing away from the impeller of the cutting body 2 forms a convexly curved side surface 8, wherein the side surface is formed by a part of a spherical surface, so that the cutting body 2 in the region facing away from the impeller forms a spherical cap or dome.
  • the side surface 8 are the cutting edges of the blades 7, so that they are correspondingly curved.
  • the radius R of the side surface 8 is with his Side surface 8 facing away from the axis of the pump shaft at the level of the pump shaft bearing, which is adjacent to the pump impeller.
  • the rotatable body 10 shown in FIGS. 4 and 5 has five sector-shaped flow openings 12 which cooperate with their edges with the cutting edges 7.
  • the cross sections of the flow openings 12 are larger in the second embodiment on the side facing away from the impeller than on the side facing away from the impeller. As a result, a safe promotion puffy solids is guaranteed in particular of hygiene articles.
  • the rotationally fixed body 10 is provided centrally between the flow openings 12 with a suction cap 13, similar to a rotor cap (FIGS. 6 and 7), which prevents clogging of the cutting unit even before the cutting plane.
  • a suction cap 13 similar to a rotor cap (FIGS. 6 and 7)
  • solids, in particular textiles are fed to the throughflow openings, instead of lying in the center between the flow openings in front of the non-rotatable body.
  • the peripheral circular body 10 is mounted in an annular flange 11 which is fixed in the pump housing, in particular screwed.
  • Body 10 and flange 11 may also be made in one piece.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Road Repair (AREA)

Abstract

The non-rotary counter-surface (9) opposite a lateral surface (8) of the blade body (2) has a concave shape corresponding to the convex shape of the lateral surface. The tool (1) comprises a rotary blade body with at least one hole (5) for the liquid to flow through and this hole defines a blade. The lateral surface of the body also contains at least one hole (12) for the liquid to flow through.

Description

Die Erfindung betrifft ein Schneidwerk einer Kreiselpumpe für mit Feststoffen belastete Flüssigkeiten, wobei das Schneidwerk einen rotierenden Schneidkörper mit mindestens einer von der Flüssigkeit durchströmten, eine Schneide bildende Öffnung aufweist und der Schneidkörper mit einer Seitenfläche einer drehfesten Gegenfläche zugewandt ist, die gleichfalls mindestens eine von der Flüssigkeit durchströmte Öffnung aufweist.The invention relates to a cutting unit of a centrifugal pump for liquids loaded with solids, wherein the cutting unit has a rotating cutting body with at least one flowed through by the liquid, forming a cutting edge and the cutting body facing with a side surface of a rotationally fixed counter surface, which also at least one of the Having liquid flowed through opening.

Es ist bekannt, das Laufrad einer Kreiselpumpe eingangsseitig mit einem Schneidwerk zu versehen, um in der geförderten Flüssigkeit enthaltene Feststoffe zu zerkleinern, so dass die Pumpe und nachfolgende Rohre und Vorrichtungen nicht verstopfen können (siehe z.B. Dokument DE-4438841-C1). Bei diesen Kreiselpumpen ist die Laufradwelle üblicherweise nur im Bereich des Antriebsmotors gelagert, so dass das Schneidwerk bei der Zerkleinerungsarbeit um das Wellenlager schwingt, das dem Pumpenlaufrad nahe ist. Zusätzlich wirkt beim Betrieb von Kreiselpumpen eine radiale Kraft auf das Laufrad, welche die Laufradwelle auf Wechselbiegung belastet. Hierdurch kommt es zumindest zwischen der äußeren Seitenfläche des rotierenden Schneidkörpers und der Gegenfläche des anliegenden, drehfesten Körpers als auch häufig an der Peripherie zu Reibungen und damit zu einem vorzeitigen Verschleiß. An der der Reibstelle in Umfangsrichtung gegenüber liegenden Seite entsteht gleichzeitig eine Spaltvergrößerung und damit die erhöhte Gefahr von Verstopfung durch nicht zerschnittene Feststoffe.It is known to provide the impeller of a centrifugal pump on the input side with a cutting unit to crush solids contained in the conveyed liquid, so that the pump and subsequent pipes and devices can not clog (see for example document DE-4438841-C1). In these centrifugal pumps, the impeller shaft is usually mounted only in the region of the drive motor, so that the cutting unit swings in the comminution work around the shaft bearing, which is close to the pump impeller. In addition, during operation of centrifugal pumps acts a radial force on the impeller, which loads the impeller shaft to alternating bending. As a result, at least between the outer side surface of the rotating cutting body and the counter surface of the adjacent, rotationally fixed body as well as often on the periphery to friction and thus premature wear. At the friction point in the circumferential direction opposite side simultaneously creates a gap enlargement and thus the increased risk of clogging by not cut solids.

Aufgabe der Erfindung ist es, ein Schneidwerk einer Kreiselpumpe so zu verbessern, dass bei hoher Schneidleistung ein geringer Verschleiß auftritt.The object of the invention is to improve a cutting unit of a centrifugal pump so that at high cutting performance low wear occurs.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass die der Gegenfläche zugewandte Seitenfläche des Schneidkörpers konvex und die Gegenfläche entsprechend konkav gewölbt sind.This object is achieved in that the counter surface facing side surface of the cutting body convex and the counter surface are correspondingly concave.

Ein solches Schneidwerk weist einen geringen Verschleiß auf, da die Flächen aneinander vorbei gleiten können. Hierbei ist auch sichergestellt, dass das Schneidwerk und die Pumpe nicht verstopfen und insbesondere längliche Fremdkörper sich nicht um den Schneidkörper und das Laufrad wickeln. Bei sicherer Lagerung sind ein solches Schneidwerk und eine damit versehene Kreiselpumpe einfach in Herstellung und Montage.Such a cutting unit has a low wear, as the surfaces can slide past each other. This also ensures that the cutting unit and the pump will not clog and in particular elongated foreign body does not wrap around the cutting body and the impeller. For safe storage, such a cutting unit and thus provided centrifugal pump are easy to manufacture and assembly.

Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen aufgeführt.Advantageous embodiments of the invention are listed in the subclaims.

Zwei Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden im folgenden näher beschrieben. Es zeigen

Fig. 1
einen axialen Schnitt durch das Schneidwerk einer ersten Ausführung,
Fig. 2
eine Seitenansicht des rotierenden Schneidkörpers nach Fig. 1,
Fig. 3
eine perspektivische Ansicht des rotierenden Schneidkörpers in kleinerem Maßstab,
Fig. 4
eine Seitenansicht des drehfesten Körpers,
Fig. 5
eine perspektivische Ansicht des drehfesten Körpers in kleinerem Maßstab.
Fig. 6
einen axialen Schnitt durch das Schneidwerk einer zweiten Ausführung,
Fig. 7
eine Seitenansicht des rotierenden Schneidkörpers nach Fig. 6,
Fig. 8
eine perspektivische Ansicht des rotierenden Schneidkörpers nach Fig. 7,
Fig. 9
eine Seitenansicht des drehfesten Körpers der zweiten Ausführung,
Fig. 10
eine perspektivische Ansicht des drehfesten Körpers der zweiten Ausführung in kleinerem Maßstab.
Two embodiments of the invention are illustrated in the drawings and will be described in more detail below. Show it
Fig. 1
an axial section through the cutter of a first embodiment,
Fig. 2
a side view of the rotating cutting body of FIG. 1,
Fig. 3
a perspective view of the rotating cutting body on a smaller scale,
Fig. 4
a side view of the non-rotatable body,
Fig. 5
a perspective view of the rotatable body in a smaller scale.
Fig. 6
an axial section through the cutting unit of a second embodiment,
Fig. 7
a side view of the rotating cutting body of FIG. 6,
Fig. 8
a perspective view of the rotating cutting body of FIG. 7,
Fig. 9
a side view of the rotationally fixed body of the second embodiment,
Fig. 10
a perspective view of the rotatable body of the second embodiment on a smaller scale.

Das Schneidwerk 1 einer Kreiselmotorpumpe weist einen rotierenden Schneidkörper 2 auf, der an der Seite des Pumpenlaufrades befestigt wird, die dem Elektromotor abgewandt ist. Der Schneidkörper 2 ist topfförmig ausgebildet und sein oberer Rand umgreift die buchsenförmige Eintrittsöffnung des Laufrades. Hierbei besitzt der obere Rand 3 vorzugsweise ein Innengewinde 4, oder eine Presspassung, mit dem es auf das Außengewinde oder zylindrische Aufnahme der Laufradeingangsöffnung aufschraubbar oder einpressbar ist.The cutting unit 1 of a centrifugal motor pump has a rotating cutting body 2, which is attached to the side of the pump impeller, which faces away from the electric motor. The cutting body 2 is cup-shaped and its upper edge surrounds the bush-shaped inlet opening of the impeller. Here, the upper edge 3 preferably has an internal thread 4, or a press fit, with which it can be screwed or pressed onto the external thread or cylindrical receptacle of the impeller inlet opening.

Der Boden des Schneidkörpers 2 weist drei Eintrittsöffnungen 5 auf, die voneinander durch Stege 6 getrennt sind, an denen radiale Schneiden 7 befestigt, insbesondere angeformt sind. Die Schneiden 7 bilden damit miteinander Winkel von 120 Grad.The bottom of the cutting body 2 has three inlet openings 5 which are separated from one another by webs 6, on which radial cutting edges 7 are fastened, in particular formed. The blades 7 thus form an angle of 120 degrees with each other.

Die Eintrittsöffnungen 5 sind unter einem Winkel zur Drehrichtung und damit schräg zur Drehachse ausgebildet, so dass der Schneidkörper 2 als "axiales Laufrad" wirkt.The inlet openings 5 are formed at an angle to the direction of rotation and thus obliquely to the axis of rotation, so that the cutting body 2 acts as an "axial impeller".

Die Unterseite und damit die dem Laufrad abgewandte Seite des Schneidkörpers 2 bildet eine konvex gewölbte Seitenfläche 8, wobei die Seitenfläche von einem Teil einer Kugelfläche gebildet wird, so dass der Schneidkörper 2 in dem dem Laufrad abgewandten Bereich eine Kugelkappe bzw. Kalotte bildet. In der Seitenfläche 8 liegen die Schneidkanten der Schneiden 7, so dass diese entsprechend gewölbt sind. Der Radius R der Seitenfläche 8 liegt mit seinem der Seitenfläche 8 abgewandten Ende auf der Achse der Pumpenwelle in Höhe des Pumpenwellenlagers, das dem Pumpenlaufrad benachbart ist.The underside and thus the side facing away from the impeller of the cutting body 2 forms a convexly curved side surface 8, wherein the side surface is formed by a part of a spherical surface, so that the cutting body 2 in the region facing away from the impeller forms a spherical cap or dome. In the side surface 8 are the cutting edges of the blades 7, so that they are correspondingly curved. The radius R of the side surface 8 is with his Side surface 8 facing away from the axis of the pump shaft at the level of the pump shaft bearing, which is adjacent to the pump impeller.

Der in den Fig. 4 und 5 dargestellte drehfeste Körper 10 weist fünf sektorförmige Durchflussöffnungen 12 auf, die mit ihren Kanten mit den Schneiden 7 zusammenarbeiten. Die Querschnitte der Durchflussöffnungen 12 sind in der zweiten Ausführung auf der dem Laufrad abgewandten Seite größer als auf der dem Laufrad abgewandten Seite. Hierdurch wird eine sichere Förderung bauschiger Feststoffe insbesondere von Hygieneartikeln gewährleistet.The rotatable body 10 shown in FIGS. 4 and 5 has five sector-shaped flow openings 12 which cooperate with their edges with the cutting edges 7. The cross sections of the flow openings 12 are larger in the second embodiment on the side facing away from the impeller than on the side facing away from the impeller. As a result, a safe promotion puffy solids is guaranteed in particular of hygiene articles.

An der Seitenfläche 8 liegt eine Gegenfläche 9 eines drehfesten Körpers 10 an, wobei der Körper 10 eine konkave Ausnehmung bildet, die entsprechend der Seitenfläche 8 geformt ist und damit denselben Radius R besitzt, wenn ein üblicherweise geringfügiger Abstand zwischen den Flächen 8 und 9 vernachlässigt wird.On the side surface 8 abuts a counter surface 9 of a rotationally fixed body 10, wherein the body 10 forms a concave recess which is shaped according to the side surface 8 and thus has the same radius R, when a usually small distance between the surfaces 8 and 9 is neglected ,

In der zweiten Ausführung ist der drehfeste Körper 10 mittig zwischen den Durchflussöffnungen 12 mit einer einer Rotorkappe ähnlichen, zur Saugseite vorstehenden Ansaugspitze 13 versehen (Fig. 6 und 7), die ein Verstopfen des Schneidwerks bereits vor der Schneidebene verhindert. Durch die Ansaugspitze werden Feststoffe insbesondere Textilien den Durchflussöffnungen zugeführt, anstatt sich im Zentrum zwischen den Durchflussöffnungen vor dem drehfesten Körper zu legen.In the second embodiment, the rotationally fixed body 10 is provided centrally between the flow openings 12 with a suction cap 13, similar to a rotor cap (FIGS. 6 and 7), which prevents clogging of the cutting unit even before the cutting plane. Through the suction tip, solids, in particular textiles, are fed to the throughflow openings, instead of lying in the center between the flow openings in front of the non-rotatable body.

Der am Rand kreisrunde Körper 10 ist in einem ringförmigen Flansch 11 befestigt, der im Pumpengehäuse befestigt, insbesondere angeschraubt wird. Körper 10 und Flansch 11 können aber auch einteilig ausgeführt sein.The peripheral circular body 10 is mounted in an annular flange 11 which is fixed in the pump housing, in particular screwed. Body 10 and flange 11 may also be made in one piece.

Claims (12)

  1. Cutting mechanism (1) of a centrifugal pump for fluids laden with solids, in which case the cutting mechanism comprises a rotating cutting body (2) having at least one opening (5) through which the fluid flows and which forms a cutting edge, and a lateral surface (8) of said cutting body is turned towards a torque-resistant mating surface (9) which likewise has at least one opening (12) through which the fluid flows, characterized in that the lateral surface (8) of the cutting body (2) facing the mating surface (9) is convexly curved and the mating surface (9) is curved so as to have a correspondingly concave shape.
  2. Cutting mechanism according to Claim 1, characterized in that the curved shape of the cutting body (2) forms a spherical cap (calotte).
  3. Cutting mechanism according to Claim 2, characterized in that the end of the radius (R) of the spherical cap lies on the axis of the pump shaft at the level of the shaft bearing which is close to the pump impeller.
  4. Cutting mechanism according to one of the preceding claims, characterized in that, at its side away from the mating surface (9), the rotating cutting body (2) can be attached to the pump impeller.
  5. Cutting mechanism according to one of the preceding claims, characterized in that the mating surface (9) is formed by a stationary body (10) which can be fixed in or on the pump casing or is formed by the pump casing.
  6. Cutting mechanism according to one of the preceding claims, characterized in that the through openings (12) taper off in direction of flow and thus are wider on the outside.
  7. Cutting mechanism according to Claim 5 or 6, characterized in that the stationary body (10) is located in an annular flange (11), which can be fixed in or on the pump casing.
  8. Cutting mechanism according to one of the preceding claims, characterized in that the rotating cutting body (2) has two to four, and preferably three, sector-shaped openings (5).
  9. Cutting mechanism according to one of the preceding claims, characterized in that the stationary body (10) has four to six, and preferably five, sector-shaped openings (12).
  10. Cutting mechanism according to one of the preceding claims, characterized in that the cutting edges (7) are formed or carried especially by the radial webs (6) located between the openings (5) of the cutting body (2).
  11. Cutting mechanism according to one of the preceding claims, characterized in that it has a suction point (13) disposed between the sector-shaped openings (12) of the stationary body and projecting towards the outlet side.
  12. Cutting mechanism according to one of the preceding claims, characterized in that the rotating cutting body (2) acts as an additional axial impeller due to the formation of the inlet openings (5) at an angle to the direction of rotation.
EP05700789A 2004-02-16 2005-01-11 Cutting tool pertaining to a centrifugal pump Active EP1716337B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL05700789T PL1716337T3 (en) 2004-02-16 2005-01-11 Cutting tool pertaining to a centrifugal pump

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004007739A DE102004007739A1 (en) 2004-02-16 2004-02-16 Cutting tool for centrifugal pump, has convex lateral surface located opposite concave fixed counter surface
PCT/EP2005/000150 WO2005078286A1 (en) 2004-02-16 2005-01-11 Cutting tool pertaining to a centrifugal pump

Publications (2)

Publication Number Publication Date
EP1716337A1 EP1716337A1 (en) 2006-11-02
EP1716337B1 true EP1716337B1 (en) 2007-03-07

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ID=34801934

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05700789A Active EP1716337B1 (en) 2004-02-16 2005-01-11 Cutting tool pertaining to a centrifugal pump

Country Status (8)

Country Link
US (1) US7520454B2 (en)
EP (1) EP1716337B1 (en)
CN (1) CN100434718C (en)
AT (1) ATE356294T1 (en)
DE (2) DE102004007739A1 (en)
DK (1) DK1716337T3 (en)
PL (1) PL1716337T3 (en)
WO (1) WO2005078286A1 (en)

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DE102008005245A1 (en) * 2008-01-19 2009-07-23 Wilo Ag Attachment of the impeller of a centrifugal pump
DE102008021767A1 (en) * 2008-04-30 2009-11-05 Ksb Aktiengesellschaft Centrifugal pump with crushing device
DE102009011444A1 (en) * 2009-03-03 2010-09-09 Ksb Aktiengesellschaft Free-flow impeller with cutting edges
US20100319116A1 (en) * 2009-06-23 2010-12-23 William Schmidt Waste Pumping System
CN102434483B (en) * 2011-12-14 2015-03-18 浙江明江环保科技有限公司 Chopping type blow-down pump
US9261095B2 (en) * 2012-08-31 2016-02-16 Cornell Pump Company Cutter system for pump suction
US9255576B2 (en) * 2012-08-31 2016-02-09 Cornell Pump Company Cutter apparatus for centrifugal pump
CN102828986B (en) * 2012-09-20 2015-11-18 台州豪贝泵业有限公司 The cutting assembly of stainless steel cut submersible pump
WO2014145910A1 (en) 2013-03-15 2014-09-18 Pentair Pump Group, Inc. Cutting blade assembly
CN103557154B (en) * 2013-11-21 2016-04-13 重庆宏美科技有限公司 A kind of water pump machine
WO2017189741A1 (en) 2016-04-26 2017-11-02 Pentair Flow Technologies, Llc Cutting assembly for a chopper pump
US10779980B2 (en) 2016-04-27 2020-09-22 Synerz Medical, Inc. Intragastric device for treating obesity
CN105926698B (en) * 2016-07-04 2018-01-05 中交天津航道局有限公司 The method of hydraulic dredger impeller blade internal diameter cutting increase sphere passage
US10473103B2 (en) * 2017-03-13 2019-11-12 Vaughan Company, Inc. Chopper pump with double-edged cutting bars
US11365738B2 (en) 2019-04-09 2022-06-21 Zoeller Pump Company, Llc Reversing grinder pump
US11161121B2 (en) 2019-05-10 2021-11-02 Jung Pumpen Gmbh Cutting blade assembly
KR102232682B1 (en) * 2020-07-20 2021-03-29 엔에스하이드로(주) Axial flow pump or Mixed flow pump) for sewage

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Also Published As

Publication number Publication date
DK1716337T3 (en) 2007-07-02
DE502005000456D1 (en) 2007-04-19
US20070164136A1 (en) 2007-07-19
ATE356294T1 (en) 2007-03-15
DE102004007739A1 (en) 2005-08-25
PL1716337T3 (en) 2007-07-31
EP1716337A1 (en) 2006-11-02
US7520454B2 (en) 2009-04-21
CN1922403A (en) 2007-02-28
WO2005078286A1 (en) 2005-08-25
CN100434718C (en) 2008-11-19

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